Electromagnet-switch.



No. 792,859. PATENTED JUNE 20, 1905.

A. SUNDH c D. L. LINDQUIST.

ELEGTROMAGNET SWITCH.

APPLIOTION FILED 00T.2'7, 1904.-

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@mi limes ne e. J .04 SZ @wwf V'UNITED STATES Patented .Tune 20, 1905.

PATENT OFFICE..

AUGUST SUN DH ANL) DAVID LEONARD LlNDQUIS', OF YONKFRS. NE\V YORK.

ELECTROMAGNET-SWITCH.

SPECIFICATION forming part of Letters Patent No. 792,859, dated June 20, 1905.

Application filed October 27, 1904. Serial No. 230,267.

Be it known that we, AUGUST SUNDH and Davio L uoNAnnLrN noUis'r, of You kers, Vestchester county, New York, have invented a new and useful Improvement in lillcctroniagnet- Switches, olI which the following is a specilication.

The invention relates to an electromagnel'.- switch constructed to be operated by alternating current.

The object ol" the invention is to prevent hammering or cl'iattering ot' the armature when attracted by the magnet.

ln another application for Letters Patent, Serial No. 230,266, simultaneously liled herewith, we have described and broadly elailned the combination, with a source ot' alternating' current, e1 an eleetromagnet-coil energized thereby, an armature therefor constructed to be moved into a position ot' magnetic equilibrium, a circuit-closing device controlled by said armature, and a resilient abutment constructed to absorb the vibrations of said armature when in said equilibrated position, due to current alternations in said coil.

Our present invention consists in a special construction ol said electromagnet in which we employ an armature having' an opening constructed loosely to receive a pole-piece on the magnet-core, the said armature being arranged to swing, and also in the combinations more pm'ticularly set torth in the claims.

ln the accompanying' drawings, Figure 1 is a section of our single-phase alterl'iating-current magnet on the line fr .fr ot' Fig. 2. Fig. 2 is a side elevation showing' also electrical connections in diagram. Fig. 3 is a top view. Fig. 4 is a section on the line 1/ ,1/ of Fig. l. Fig. 5 shows a modilication in the Vt'orm of circuit-terminal.

Similar numbers of reference indicate like parts.

1 represents the supporting base-plate.

2 is the magnet-coil, extending through which is the laminated core 3, having two projections and 6, which extend, respectively, above and below said coil.

Secured to the plate 1 by a bolt 7 is a bracket 8, having' au integral arm f), Fig. L1,

provided with a lug 10 on its upper side. A separate and similar bracket-arm .11 is provided with a similar lug 12. The upper projection 5 of the laminated core 3 is placed bctwecn the bracket-arms 11 and l) and clamped by means et' the headed bolt 13, which passes through the lugs 10 and 12 and is secured by a nut. A similar bracket 14, having an integral arm and a separate arm, is also secured to the supporting-plate 1 below the bracket 8, and in like manner between said arms is clamped the lower `projection 6 ot' the core rlhe lugs en the under side otA the arms ot' bracket 14C are extended, as shown at 15, to receive the pivot-pin 16 et the swinging armature-'trame 17. Said `frame has two arms 19 and 20, which receive between them the laminated armature 21, which is clamped between said arms by means ol the bolts 2Q passing' through lugs The arm 2O at its upper end is turned at right angles to meet the arm 19. so that said arms, together with the lugs on bracket 14 and the collar 18, carried bythe pivot-pin, form the quadrangular frame 17. In the armature is an opening' 21, which when the frame 17 is swung toward the magnet receives the polar extremity 25 et the upper projection 5 ot' the laminated core. The opening Q1 is sulliciently large to permit the pole-piece 25 to enter it freely without touching the sides.

Through the turned upper portion o1 the arm 2O passes a threaded sleeve 26,and through said sleeve passes a threaded rod Q7, secured by nut 27X. Loose on said rod 2T is a circuitcloser plate-28, outside of which is a stop-pin 29. Between plate Q8 and sleeve Q6 is interposed a helical spring 30, which normally presses the plate 28 outward against pin 29. A set-screw 31* passes through the upper end of trame-arm 19 and enters arm 2O sutleiently to bear against the thread of sleeve Q6. The sleeve .26 may be adjusted longitudinally to vary the tension ot' helical spring' 30 and when adjusted is jammed by setting in the screw 31;VCA and so held as placed.

Secured to the siumorting-plate 1 are two brackets 31 32, each carrying a threaded contact-terminal The ends oli' said brackets are forked and provided with clamping-screws 34 for holding said terminals in adjusted position. The brackets`31 32 may be connected, as shown in Fig. 2, in a circuit, which also includes a solenoid 35, controlling a circuitcloser 36, whereby circuit may be established through translating devices, such as electric lamps, (indicated at 37.) The terminals of the magnet-coil may be connected to a secondary coil 38, disposed in inductive proximity to a primary coil 39, energized from any suitable source 40 of single phase alternating current.

The operation of the device is as follows: Vhen the magnet-coil is energized, the armature is attracted and the frame 17 swings inward, so that the pole-piece 25 enters the opening 24. The circuit-closing plate 28 then meets the terminals 33,thus establishing the circuit shown in Fig. 2 and causing the solenoid 35 to close circuit.

It will be apparent that by reason of the foregoing construction the pull of the polepiece 25 upon the armature rapidly decreases in strength as the pole-piece enters the armature-opening, so that it is weakest when the plate 28 is in contact with the terminals 33. I-Icnce the influence of changes in current strength upon the armature is then reduced to a minimum.

Particular attention iscalled to the fact that the armature when in attracted position does not come in contact with any rigid or unyielding abutment and that, on the contrary, its only abutment is then a resilient or elastic body-to wit, the spring 30, which spring both receives the thrust of the armature due to the magnetic pull and acting in the direction of the path of movement of the circuitclosing plate 28 toward terminal 33 also absorbs the Vibrations of said armature due to current alternations in the electromagnetcoil, thus preventing the communication of Said vibrations to said circuit-closing plate.

Instead of arranging the terminals 33 in brackets, as described, we may arrange them as shown in Fig. 5. Here the terminals of dovetail section are disposed in holding-plates 41, which slide freely on pins 42, which eX- tend from plates 43, bolted to the supportingplate 1. Said plates 41 are set outwardly by helical springs 44 against stop-pins 45. The springs 44 then coact with the helical spring 3() in taking up the armature vibrations and forming a resilient abutment.

We claim- 1. A source of alternating current, an electromagnet-coil energized thereby, a support, an armature, pivoted at one end to said support and extending in front of a pole of said magnet and movable on its pivot to a position of magnetic equilibrium, a resilient body wherewith said armature establishes contact when moved to said position, and a circuitcloser controlled by said armature; the said resilient body being constructed to take up the vibrations of said armature due to current alternations in said coil.

2. A source of alternating current, an electromagnet-coil energized thereby, a support, an armature pivoted at one end to said support and extending in front of a pole of said magnet and movable on its pivot to a position of magnetic equilibrium, a resilient body wherewith said armature establishes contact when moved to said position, means for varying the resiliency of said body, and a circuitcloser controlled by said armature; the said resilient body being constructed to take up the vibrations of said armature due to current alternations in said coil.

3. A source of alternating current, an electromagnet-coil energized thereby, an armature pivoted to a polar extremity of the core of said coil and extending in front of the other polar extremity of said core, and movable on its pivot to a position of magnetic equilibrium, a resilient body wherewith said armature establishes contact when moved to said position, and a circuit-closer controlled by said armature; the said resilient body being constructed to take up the vibrations of said armature due to current alternations in said coil. 4. A source of alternating current, an electromagnet energized thereby, a projecting pole-piece on said magnet, a movable armature having an opening loosely receiving said pole-piece, a circuit-closer controlled by said armature and a resilient abutment receiving the thrust of said armature and constructed to absorb thc vibrations thereof due to current alternations in said coil.

5. A source of alternating current, an electromagnet energized thereby, a projecting pole-piece on said magnet a swinging armature having an opening loosely receiving said pole-piece, a circuit-closer carried by said armature and a spring interposed between saidv circuit-closer and said armature; the said spring forming an abutment for said armature and constructed to absorb the vibrations thereof due to current alternations in said coil.

6. An electromagnet-coil, a fixed core therefor having a laterally-extending pole-piece, a swinging armature provided with an opening constructed loosely to receive said pole-piece, a circuit-closing plate on said armature and a spring supporting said plate and forming a resilient abutment for said armature.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses. f

AUGUST SUNDII. DAVID LEONARD LINDQUIS'I.

Witnesses:

WM. H. SIEGMAN, I. A. VAN WART.

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